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= 9 = <br /> TABLE 1, CONT. <br /> SUMMARY OF GROUNDWATER ELEVATION AND ANALYTICAL DATA <br /> SHOP 10 MAINTENANCE STATION <br /> STOCKTON, CALIFORNIA <br /> PAGE 7 of 7 <br /> TOC =Top of casing elevations <br /> MSL= Mean Sea Level <br /> TPHG =Total Petroleum Hydrocarbons as Gasoline by EPA Method 8015M <br /> TPHD=Total Petroleum Hydrocarbons as Diesel by EPA Method 8015M <br /> BTEX= Benzene, Toluene, Ethylbenzene, and Total Xylenes by EPA Method 8020 <br /> MTBE= Methyl Tertiary Butyl Ether by EPA Method 8020 <br /> <= Less than method detection limits <br /> ------- = Not measured, sampled tested, or present <br /> RWQCB= Central Valley Regional Water Quality Control Board <br /> All measurements are presented in feet <br /> mgll = milligrams per liter <br /> pgll= micrograms per liter <br /> (<5) = MTBE concentration calculated by EPA Method 8260 <br />